CN109281647A - A kind of acidization tool of carbonate reservoir horizontal well - Google Patents
A kind of acidization tool of carbonate reservoir horizontal well Download PDFInfo
- Publication number
- CN109281647A CN109281647A CN201811433820.4A CN201811433820A CN109281647A CN 109281647 A CN109281647 A CN 109281647A CN 201811433820 A CN201811433820 A CN 201811433820A CN 109281647 A CN109281647 A CN 109281647A
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- Prior art keywords
- acid
- acidization tool
- horizontal well
- tool according
- acidization
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The present invention provides a kind of acidization tools of carbonate reservoir horizontal well.The acidization tool includes: step 1: acid solution is injected into horizontal well, injection flow is 0.5m3/m‑3m3/m；Step 2: injection fibrous foam base VES acid, injection flow are 0.3m3/m‑1.5m3/m；According to the length of horizontal well, the horizontal well horizontal section length circulation primary step 1 of every 60m-100m completes the acidification to carbonate reservoir horizontal well to step 2.Acidization tool of the invention can significantly improve the acidizing effect of horizontal well, and to reservoir fanout free region.
Description
Technical field
The present invention relates to a kind of acidization tool more particularly to a kind of acidization tools of the horizontal well of Carbonate Reservoir, belong to
Technical field of petroleum extraction.
Background technique
Carbonate acidizing, which refers to, reacts acidic fluid with carbonate reservoir, to release nearly pit shaft area pollution or change
It is apt to the method for such reservoir permeability.During Carbonate acidizing, acid preferentially seeps that condition is preferable or natural fracture hole is sent out with hole
The stratum contact educated, and the permeability in such region is further increased, these layers are then proceeded to, journey is employed in low porosity permeability region
It spends lower, it is difficult to realize homogeneous acidification.To realize the homogeneous acidification to heterogeneity carbonate reservoir, it is necessary to keep acid low in
It seeps with more haptoreactions in hole.
Mechanical coupling segment steering and chemistry diversion acidification transformation, but current technology can be used in carbonate reservoir homogeneous acidification
It is primarily present following deficiency:
(1) packer steering construction is complicated, time-consuming, at high cost, and the not applicable longer horizontal well of horizontal segment；
(2) it blocks up ball to turn to due to Horizontal Well segment length, injection discharge capacity is low, and stifled ball sets difficulty；
(3) the temporary stall of foamed acid is to since foam temperature tolerance is poor and high permeability formation leak-off (filtering feature of drilling fluid) is tight
Weight, thus application range is limited；
(4) diverting agent turns to mainly by forming the filter cake of hyposmosis in high permeability formation, but Carbonate acidizing can generate
Earthworm hole, and the filter cake formed around diverting agent, turning efficiency are bad；
(5) VES turns to acid and is controlled thickening by pH value, but rheological characteristic is poor, therefore uniform acid distribution effect is limited.
Summary of the invention
In order to solve the above-mentioned technical problem, collect viscosity, foam, temporarily stifled shunting in one the purpose of the present invention is to provide a kind of
The homogeneous acidification method of body can significantly improve the acidizing effect of horizontal well, and to reservoir fanout free region.
In order to achieve the above technical purposes, the present invention provides a kind of acidization tools of carbonate reservoir horizontal well, should
Acidization tool the following steps are included:
Step 1: injecting acid solution into horizontal well, and injection flow is 0.5m3/m-3m3/m；
Step 2: injection fibrous foam base VES acid, injection flow are 0.3m3/m-1.5m3/m；
According to the length cycles above-mentioned steps one and step 2 of horizontal well, in the every 60m-100m circulation primary of horizontal section length
Step 1 and step 2 are stated, the acidification to carbonate reservoir horizontal well is completed.
In acidization tool of the invention, it is initially injected conventional acid solution, high permeability formation is acidified；Reinject fibrous foam
Base VES acid is temporarily blocked up and is shunted from viscosity building characteristic and fiber winding accumulation using the Jamin effect of foam, VES, carries out to high permeability formation
High permeability formation (temporarily being blocked up to high permeability formation) is blocked while deep acidizing；Finally by the conventional acid solution of alternately injection and fibrous foam
Base VES acid, realizes the transformation of horizontal well multistage homogeneous acidification.
In acidization tool of the invention, the injection rate in step 1 and step 2 is determined on the basis of reservoir thickness
's.For example, injection rate when injecting acid solution in step 1 is 0.5m3/m-3m3/ m refers to every meter of reservoir thickness injection acid solution
0.5m3-3m3。
In acidization tool of the invention, it is preferable that the sum of the mass percent with each raw material of fibrous foam base VES acid is
100% meter, the raw material composition of the fibrous foam base VES acid of use are as follows: the acid of 5%-28%, the diversion agent of 6%-8%, 1%-
2% corrosion inhibiter, the ferrous stability of 1%-2%, the clay stabilizer of 1%-2%, the fiber of 0.5%-2% and surplus
Water.
In acidization tool of the invention, specifically, carrier occurs by foam of nitrogen.
More specifically, the foam volume score of fibrous foam base VES acid can be 80%-95%.
Specific embodiment according to the present invention, the fibrous foam base VES acid are injected by foam maker, such as can be with
Using foam maker as shown in Figure 1, gas is injected along the first pipeline 1, and the raw material of fibrous foam base VES acid is by the second pipeline
2 injections ultimately form fibrous foam base VES acid through foam maker.
In acidization tool of the invention, the acid in the raw material of fibrous foam base VES acid can link up storage with corrosion rock
Layer.Specifically, the acid used is the combination of one or more of hydrochloric acid, hydrofluoric acid, formic acid, acetic acid, citric acid and glycolic.
In acidization tool of the invention, the diversion agent in the raw material of fibrous foam base VES acid plays temporarily stifled high permeability formation,
The effect of even cloth acid.
Specifically, the diversion agent used is betaines amphoteric surfactant；Further, the diversion agent used can be with
For the DCA-1 type VES diversion agent produced by Beijing KeMaiShi Oil Field Chemical regent Technology Co., Ltd.
In acidization tool of the invention, specifically, the corrosion inhibiter of use is compound by organic amine derivatives and alkynol
Into what is obtained；Further, the corrosion inhibiter used (is had for DCA-6 type corrosion inhibiter by Beijing Ke Maishi Oilfield Chemicals technology
Limit company production).
In acidization tool of the invention, the ferrous stability in the raw material of fibrous foam base VES acid can be with Complexing Iron
Ion prevents iron gel precipitation from damaging to reservoir.
Specifically, the ferrous stability used is organic phosphate.Further, the ferrous stability used is can
With the DCA-F sections ion stabilizer to be produced by Beijing KeMaiShi Oil Field Chemical regent Technology Co., Ltd.
In acidization tool of the invention, the clay stabilizer in the raw material of fibrous foam base VES acid can stablize clay
Mineral prevent clay mineral water swelling, injury of the dispersion migration clay mineral to reservoir.
Specifically, the clay stabilizer used can be the pure potassium chloride of analysis.
In acidization tool of the invention, the fiber in the raw material of fibrous foam base VES acid plays bridge formation temporarily stifled high permeability formation,
Diversion agent is cooperateed with to realize the effect of uniform acid distribution.
Specifically, the fiber used is fine for hydroxypropyl methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose or polyester
Dimension.Further, the fiber used is degradable for the DCF-1 type produced by Beijing KeMaiShi Oil Field Chemical regent Technology Co., Ltd
Polyester fiber.
In acidization tool of the invention, in step 1, the acid solution of injection can be the conventional acid solution of this field, to adopting
Conventional acid solution does not have particular/special requirement.
Specifically, in step 1, the acid solution used is in hydrochloric acid, hydrofluoric acid, formic acid, acetic acid, citric acid and glycolic
One or more of combinations.
Acidization tool of the invention is used in the case where being lower than formation fracture pressure, utmostly to improve reservoir.
Acidization tool of the invention is suitable for the acidification of carbonate reservoir horizontal well, is particularly suitable for long well section horizontal well
Uniform acid distribution.
There is the acidization tool of carbonate reservoir horizontal well of the invention foam separation capacity, VES to divide from viscosity is viscosified
The synergistic combination of the temporary stifled separation capacity three of stream ability and foam accumulation, shunted with individual foam, from viscosify viscosity shunt or
Fiber accumulations are temporarily blocked up separate system and are compared, and integrate viscosity, foam, temporarily block up the acid fluid system shunted to Uniform Horizontal Well acidification
Effect is more effective；It solves the problems, such as the acidification of long well section Uniform Horizontal Well, is provided for strong Heterogeneous reservoir acid stimulation
Effective acidization tool.
The acidization tool of carbonate reservoir horizontal well of the invention integrates viscosity, foam, temporarily stifled shunting, has good
Shunting effect well can effectively reduce construction cost, be easy to operate, and difficulty of construction is low, and to reservoir fanout free region.
Detailed description of the invention
Fig. 1 is the structure chart of foam maker of the invention.
Main Reference symbol description
1 first pipeline, 2 second pipeline
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment 1
Present embodiments provide a kind of acidization tool applied to Tarim Basin Donghe oilfield X well comprising following step
It is rapid:
East River X well location is constructed in East River 1, well depth 5700m, reservoir thickness 40m, is acidified the long 480m of purpose well section, well logging
Explain weighted average porosity 17.4%, oil saturation 73%.Naturally it goes into operation within the well on 2 20th, 2016, initial stage day oil-producing
45.16t, until on 2 2nd, 2017, day oil-producing 18t.The condition of production before being acidified: liquid level is low, and feed flow is insufficient, goes out liquid.The well water
Flat section is longer, considers uniform acid distribution, intends being transformed with fibrous foam base VES acid acid fracturing.
Step 1: conventional acid acid 60m is injected into horizontal well3(injection flow is 1.5m3/m)；
Step 2: continue to inject fibrous foam base VES acid 12m3(injection flow is 0.3m3/m)；
Step 3: horizontal section length 480m, every 80m are repeated once, and recycle above-mentioned steps one and step 26 times, complete
Paired parallel horizontal wells carries out the acidification transformation of multistage uniform acid distribution.
After X well acidizing pressing crack construction, liquid is produced daily by 22t and increases to 84t, wherein day oil-producing increases to 54t, acid stimulation by 18t
Correctional effect is obvious.
Embodiment 2
Based on laboratory core flow device, rock core flowing experiment is carried out using Haffa Asia A well rock core, tests fibrous foam base
The injury situation to reservoir of VES acid, experimental procedure are as follows:
1. connecting equipment, hunts leak, measure its permeability using normal saline solution.
2. under the charge velocity of the minimum critical flow velocity lower than rock core, by the residual of fibrous foam base VES acid after breaking gel
3 times of pore volumes of sour inverse injection rock core.
3. reusing normal saline solution, measurement determines residual acid protection reservoir performance by the permeability of rock core after residual acid pollution.
Experimental result: table 1 gives the reservoir core flowing experiment result of residual acid after breaking gel.
The evaluation result of 1 fibrous foam base VES acid breaking glue solution of table damage reservoir
By the experimental result in table 1 it can be seen that the residual acid solution of fibrous foam base VES acid after breaking gel is to the infiltrations of three blocks of rock cores
Saturating rate recovery value is all very high, and up to 100%, minimum also to reach 98.43%, mean permeability recovery value reaches 99.21%,
The permeability damage rate of rock core is averagely only 0.79%, illustrates that the permeability of rock core is not damaged substantially.Fibrous foam base VES acid
Breaking glue solution damages core permeability very little, and protection reservoir effect is good.
Claims (10)
1. a kind of acidization tool of carbonate reservoir horizontal well, which is characterized in that the acidization tool the following steps are included:
Step 1: injecting acid solution into horizontal well, and injection flow is 0.5m3/m-3m3/m；
Step 2: injection fibrous foam base VES acid, injection flow are 0.3m3/m-1.5m3/m；
According to the length of horizontal well, the every 60m-100m circulation primary step 1 of horizontal section length and step 2 are completed to carbonate
The acidification of rock reservoir-level well.
2. acidization tool according to claim 1, which is characterized in that with the matter of each raw material of the fibrous foam base VES acid
The sum of percentage is measured as 100% meter, the raw material of the fibrous foam base VES acid forms are as follows: the acid of 5%-28%, 6%-8%'s
Diversion agent, the corrosion inhibiter of 1%-2%, the ferrous stability of 1%-2%, the clay stabilizer of 1%-2%, 0.5%-2%'s
The water of fiber and surplus.
3. acidization tool according to claim 1 or 2, which is characterized in that carrier occurs by foam of nitrogen；Preferably,
The foam volume score of the fibrous foam base VES acid is 80%-95%.
4. acidization tool according to claim 2, which is characterized in that the corrosion inhibiter is by organic amine derivatives and alkynes
What alcohol was combined；Preferably, the corrosion inhibiter is DCA-6 type corrosion inhibiter.
5. acidization tool according to claim 2, which is characterized in that the ferrous stability is organic phosphate；It is excellent
Selection of land, the ferrous stability are DCA-F sections ion stabilizer.
6. acidization tool according to claim 2, which is characterized in that the diversion agent is beet alkali ampholytic surface active
Agent；Preferably, the diversion agent is DCA-1 type VES diversion agent.
7. acidization tool according to claim 2, which is characterized in that the clay stabilizer is to analyze pure potassium chloride.
8. acidization tool according to claim 2, which is characterized in that the fiber is hydroxypropyl methyl cellulose, hydroxypropyl
Base cellulose, hydroxyethyl cellulose or polyester fiber；Preferably, the fiber is DCF-1 type biodegradable polyester fiber.
9. acidization tool according to claim 2, which is characterized in that the acid is hydrochloric acid, hydrofluoric acid, formic acid, acetic acid, lemon
The combination of one or more of lemon acid and glycolic.
10. acidization tool according to claim 1, which is characterized in that in step 1, the acid solution is hydrochloric acid, hydrogen fluorine
The combination of one or more of acid, formic acid, acetic acid, citric acid and glycolic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811433820.4A CN109281647A (en) | 2018-11-28 | 2018-11-28 | A kind of acidization tool of carbonate reservoir horizontal well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811433820.4A CN109281647A (en) | 2018-11-28 | 2018-11-28 | A kind of acidization tool of carbonate reservoir horizontal well |
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| CN109281647A true CN109281647A (en) | 2019-01-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090272534A1 (en) * | 2007-03-21 | 2009-11-05 | Baker Hughes Incorporated | Methods of using viscoeleastic surfactant gelled fluids to pre-saturate underground formations |
| CN102443386A (en) * | 2011-12-13 | 2012-05-09 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Energy enhancing steering acid liquid system |
| US20120305246A1 (en) * | 2009-10-28 | 2012-12-06 | Yiyan Chen | Shear-activated viscoelastic surfactant fluid and method |
| CN105041289A (en) * | 2015-07-13 | 2015-11-11 | 中国石油大学(北京) | Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged |
| CN105041288A (en) * | 2015-07-13 | 2015-11-11 | 中国石油大学(北京) | Fractural diverting acid-fracturing method for carbonate oil-gas reservoirs |
| CN105089603A (en) * | 2015-07-13 | 2015-11-25 | 中国石油大学(北京) | Reservoir modifying method through forming crack network by temporary plugging turning in cracks |
-
2018
- 2018-11-28 CN CN201811433820.4A patent/CN109281647A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090272534A1 (en) * | 2007-03-21 | 2009-11-05 | Baker Hughes Incorporated | Methods of using viscoeleastic surfactant gelled fluids to pre-saturate underground formations |
| US20120305246A1 (en) * | 2009-10-28 | 2012-12-06 | Yiyan Chen | Shear-activated viscoelastic surfactant fluid and method |
| CN102443386A (en) * | 2011-12-13 | 2012-05-09 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Energy enhancing steering acid liquid system |
| CN105041289A (en) * | 2015-07-13 | 2015-11-11 | 中国石油大学(北京) | Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged |
| CN105041288A (en) * | 2015-07-13 | 2015-11-11 | 中国石油大学(北京) | Fractural diverting acid-fracturing method for carbonate oil-gas reservoirs |
| CN105089603A (en) * | 2015-07-13 | 2015-11-25 | 中国石油大学(北京) | Reservoir modifying method through forming crack network by temporary plugging turning in cracks |
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